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  • Sparsity vs sparseness - English Language Usage Stack Exchange
    What is the difference between sparsity and sparseness? Is it that the latter emphasises the extent to which something is sparse? I'm not sure I can see the thin line that separates them
  • How do I output sparseness of a file? - Unix Linux Stack Exchange
    Wonder what the sparseness of that should be Besides, isn't that definition the wrong way around, surely a normal (i e non-sparse) file should have sparseness zero?
  • How to get the actually used size of a sparse file?
    I would like to know, how much is a sparse file really using on the disk ls, stat and similar commands all seem showing its virtual size, i e with the holes I want to know the real disk usage of the file, without the holes How can I do that?
  • Finding sparse files? - Unix Linux Stack Exchange
    27 Is there a straightforward way to find all the sparse files on my system, or in a particular directory tree? If it's relevant, I'm using zsh on Ubuntu 12 04, although a more generic Unix-y answer for bash sh, for example, would be fine Edit: to clarify, I'm looking to search for sparse files, not check the sparseness status of a single one
  • What are functions to manipulate sparse files under Linux?
    On Linux, you can retrieve details of files’ sparseness using the fiemap ioctl, and e2fsprogs ’ filefrag(8); see Detailed sparse file information on Linux On the writing side, you can use fallocate(2) (and the handy fallocate(1) utility) to punch holes in an existing file, making it sparse if the holes cover entire blocks
  • linux - Is it possible to delete sections of a sparse file? - Unix . . .
    Under Linux, you can punch holes in a file using fallocate() ’s FALLOC_FL_PUNCH_HOLE flag (combined with FALLOC_FL_KEEP_SIZE): fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, offset, length); On file systems which support this operation, this will increase the file’s sparseness if the offset and length combination cover entire blocks; anything else will only be zeroed On file
  • Understanding sparse files, dd, seek, inode block structure
    Some copying utilities have options to preserve sparseness, eg tar --sparse, rsync --sparse Note, you can explicitly convert the suitably aligned zero blocks in a file to sparseness by using cp --sparse=always and the reverse, converting sparse space into real zeros, with cp --sparse=never
  • hard disk - Is dd a reliable tool to make an SSD image? - Unix . . .
    Although I think sparseness detection works in units of the bs, so you might want a smaller block size like 16k For a device that might have read errors, certainly ddrescue is a very good choice, but other than that you don't need it If you know its options then by all means use it
  • Tell if a file is a sparse file - Unix Linux Stack Exchange
    The accepted answer there is quite straightforward -- a one-liner The find part will need to be tailored for your requirements -- as posted, it searches all files from the root directory The format after the -printf uses %S to show the estimated proportion of 'real' data blocks, and %p to show the pathname This is piped to an awk script which only lists the files that use fewer disk blocks
  • cp - Moving sparse files - Unix Linux Stack Exchange
    cp not only auto-detects sparse files but also has --sparse=always option I wonder if mv works with the same mechanism or the safe way for moving sparse files is cp amp; amp; rm Or is there any





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